Does not fit factory benelli m4 receiver. poor support c/s - Black River Manufacturing Ported Benelli M4 12 Gauge Shotgun Barrel

Pros - Price! Factory barrel cost $750 more!
Cons - Fit. The M4 barrel has an alignment tab. The alignment on the Black River MFG is about .042 thicker than benelli m4 barrel. Almost appears to be missing a machining step. I will attempt to include uploaded pics with a side by side with the tabs circled red for Black River MFG and yellow for the benelli M4 barrel.
Con - Poor tech and customer support at Black River MFG. E-mailed them in advance and asked if this would fit a production Benelli M4 receiver. I was told it would. After receiving and discovering the issue, I inquired if this is a QC issue or perhaps the barrels are not 100% benelli compatible. Maybe the product should state fitting required. This is no reflection on Optics Planet. This is a product manufacturing issue. I asked Black River if this is a one off error, should I exchange. I was told to return for refund. An indirect way of saying it won't fit a benelli if I ever heard one. I plan on machining imperfections and trying the barrel. I'll update then. Note tested in 4 Benelli M4. I don't currently own a turkish M4 clone to try.